趋势解读：Anthropic releases Claude Fable 5 and Mythos 5，提升开发者接入体验

Anthropic has released two new fifth-generation AI models: Claude Fable 5 for general use and Claude Mythos 5, which is initially available only to selected partners for specialized areas such as cyber security. Fable 5 outperforms all of Anthropic's previous models, achieving top scores in benchmarks for programming, image processing, and complex data analysis, while Mythos 5 shows strong performance in drug design and operates largely autonomously in genomics research. The new models come at a price of 10 US dollars per million input tokens, making them nearly twice as expensive as the Claude Opus 4.8 model, with token efficiency still to be determined. Anthropic releases two new models in the fifth Claude generation. Claude Fable 5 claims the top spot in nearly all benchmarks, while Claude Mythos 5 (no longer in preview) is still only available to select partners. Both models share the same base model. Fable 5 ships with conservative safety guardrails for general use. Mythos 5 drops those restrictions in areas like cybersecurity and is reserved for a small group of partners. Anthropic says Fable 5 beats every generally available model the company has ever shipped and claims state-of-the-art results in nearly all benchmarks tested. The gap widens on long, complex tasks, the company states. Ad On SWE-Bench Pro, a benchmark for solving real software engineering tasks from public GitHub repos without help, Fable 5 hits 80.3 percent. Claude Opus 4.8 lands at 69.2 percent, GPT 5.5 at 58.6 percent, and Gemini 3.1 Pro at 54.2 percent. Ad DEC_D_Incontent-1 On Cognition's FrontierCode benchmark, which tests demanding coding tasks under production standards, Fable 5 scores 29.3 percent. Claude Opus 4.8 manages 13.4 percent. GPT 5.5 gets just 5.7 percent. Fable 5 is also more token-efficient than earlier Claude models, Anthropic claims. At medium effort, it posts the top score among all frontier models on FrontierCode. Payment processor Stripe says Fable compressed five months of engineering work into days. In a Ruby codebase with 50 million lines, the model finished a migration in one day that would have taken a full team over two months. Ad Fable 5 also tops the charts on complex analytical tasks, according to Anthropic. On Hebbia's Finance Benchmark, which tests AI reasoning at the level of seasoned financial analysts, it posted the highest score of any model, with gains in document-based reasoning and chart and table interpretation. Trading group IMC says Fable 5 passed their trading analysis evaluations almost across the board. On vision tasks, Fable 5 is the new state-of-the-art model, Anthropic says. It can pull precise figures from detailed scientific illustrations and rebuild a web app's source code from screenshots alone. As a demo, Fable 5 played through Pokemon FireRed using only game screenshots. Earlier models needed a complex helper framework with extra tools and access to additional game data like maps. Ad DEC_D_Incontent-2 Anthropic says Fable 5 stays focused across millions of tokens and boosts its own results by taking notes. The company didn't share specific benchmarks here. Ad